#!/usr/bin/env python3
"""
脚本名称：ch21_exe.py
功能描述： 演示函数返回
作者：Gavin
创建日期：2022-05-06
版本：1.0
依赖库：无
使用方法： python ch21_exe.py
"""


def add(a, b):
    print("ADDING %d + %d" % (a, b))
    return a + b


def subtract(a, b):
    print("SUBTRACTING %d - %d" % (a, b))
    return a - b


def multiply(a, b):
    print("MULTIPLYING %d * %d" % (a, b))
    return a * b


def divide(a, b):
    print("DIVIDING %d / %d" % (a, b))
    return a / b


print("Let's do some math with just functions!")
age = add(30, 5)
height = subtract(78, 4)
weight = multiply(90, 2)
iq = divide(100, 2)
print("Age: %d, Height: %d, Weight: %d, IQ: %d" % (age, height, weight, iq))

# A puzzle for the extra credit, type it in anyway.
print("Here is a puzzle.")
what = add(age, subtract(height, multiply(weight, divide(iq, 2))))
# （age + (height - (weight x (iq/22))）
print("That becomes: ", what, "Can you do it by hand?")
